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Beware Hollywood’s digital demolition: it’s as if your favourite films and TV shows never existed
(www.theguardian.com)
this post was submitted on 01 Oct 2024
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I had a friend with a huge copied VHS library. He ordered his equipment from Germany. No macrovision on equipment there so his copies were very good.
Was this in the US? Because then you had PAL vs NTSC, which is think would be an even bigger problem.
All US made VCR's had a circuit in them called macrovision. Its what caused the distortion in the copies when the tape was recorded with it. The German units did not have this. He purchased them through friends who were in the military. They bought them from the base exchange or px I don't remember which. As far as PAL and NTSC I'm pretty sure he had something to deal what that as well. The guy bought the second VCR in the state right behind some super rich guy. He still had it in the 90's and it took up most of a fairly large table.
Up until he died he made copies of everything he could get his hands on. He lived right on a county line and arranged it with his neighbor across the road in the other county to drop his netflix DVD's in his mail box for pickup. He would get his DVD's in the morning rip them and then put them in the neighbors mailbox before noon. It would be picked up that day and he would repeat the process. When he died I ended up with a huge amount of ripped DVD's that I eventually gave to someone just to get them out of my way. I kinda regret that sometimes.
https://en.wikipedia.org/wiki/Analog_Protection_System
For ntsc vhs players it wasnt a component in the vcr that was made for copy protection. They would add garbled color burst signals. This would desync the automatic color burst sync system on the vcr.
CRT TVs didn't need this component but some fancy tvs would also have the same problem with macrovission.
The color burst system was actually a pretty cool invention from the time broadcast started to add color. They needed to be able stay compatible with existing black and white tv.
The solution was to not change the black and white image being sent but add the color offset information on a higher frequency and color TVs would combine the signals.
This was easy for CRT as the electron beam would sweep across the screen changing intensity as it hit each black and white pixel.
To display color each black and white pixel was a RGB triangle of pixels. So you would add small offset to the beam up or down to make it more or less green and left or right to adjust the red and blue.
Those adjustment knobs on old tvs were in part you manually targeting the beam adjustment to hit the pixels just right.
VCRs didn't usually have these adjustments so they needed a auto system to keep the color synced in the recording.
You should probably read that wikipedia link. I built some of the blockers or stabilizers as Wikipedia article describes them. You could see the pulses described in the output of a scope that messed up the AGC in the VCR. All the blocker did was blank out the pulses and that was enough to prevent macrovision from working on the VCR when making a copy.